Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9a9c9b9590dcbd2388bba3cb968855a97f9ed125ea26e73646c00dff219fb82' 
  AND token = 'Z/uKmv5qEbTv0c9gvIngQ5xp/MeoZA5zXiG1D5PcAsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}